Spiral metallic hose.



E. Wl TZEN MANN.

SPIRAL METALLIC HOSE.

APPLICATION FILED MR. 9. 1914- Patented June 25, 1918.

EMIL WITZENMANN, 0F PFORZHEIM, GERM l SPIRAL METALLIC HOSE.

Specification of Letters Patent. Pfitntdk Juume 25 11911 Applicationfiled March 9, 1914. [Serial No. 823,322.

To all whom it may concern:

Be it known that LEMIL WITZENMANN, a German subject, residin at No. 48Holzgartenstrasse, Pforzheim, ermany, have invented new and usefulImprovements in Spiral MetallicHose, of which thefollowmg is aspecification. I

This invention relates to spiral metallic hose of the kind in which themetal tape forming such hose is undulated in itscross direction, so thatthe wall of the hose is undulated in the longitudinal direction.

Such special formation of the hose wall allows the joints of the hose tobe tightened by autogenous welding, without afl'ect ing the flexibilityof the hose ascompared with the usual hose consistin of a spirally-woundtape the edges of which engage one another.

It has been found desirable, for certain purposes, to dispense with thesaid Welding. The present invention has for its 'object to obtain thisresult. According to the invention the longitudinal edges of the metaltape forming the hose are bent outward to present flanges forming thespiral joint of the hose, and this joint is covered and tightened by agroove-like spiral metal tape, while a packing may be arranged to coveror fill up the said joint. I

The invention will be fully understood from the following descriptionand be particularly pointed out in the appended claim, reference beinghad to the accompanying drawing which shows different forms of construction embodying the invention.

In this drawing Figure 1 is an elevation, partly in section, of a hoseconstructed according to the invention, while Figs. 2, 3, 4, 5 and 6,drawn to a larger scale, are sectional views showing different forms ofconstruction of the invention.

The metal tape a forming the hose is undulated in its cross direction,as is best seen from Fig. 1. The longitudinal edges of this metal tapeare bent outward to form flanges b, b of which Figs. 2 to 5 show variousforms.

In Fig. 2, the flanges b, b are of a simple, straight shape and pressedagainst one another by a'groove-like spiral metal tape a covering theflanges and the joint between them. Between the tape 0 and thecircumferential face of the flanges a packing d is interposed which hasthe form of a cord.

As shown in Fig. 3, the flanges b, b may be bent laterally in oppositedirections at their ends and in the spiral groove thus formed receivethe packing d which is held in place by the tape 0.

According to Flg. 4; the packing is constituted by a band d which underthe action of the tape 0 embraces the flanges b, b.

As shown in Fig. 5, the flanges b, b may be bent at right angles inopposite directions so as to present a cylindrical spiral face for thepacking band 03 to rest upon.

It will be noted that the tightening takes place not only along theouter walls of the undulations, but also between two undulations.

The packing may be of any kind and may consist of any suitable material.Thus it may be made of a soft metal such as soft copper, lead &c., or ofaluminium; of fibrine, such as asbestos, packing thread, ramie fiber;further it may consist of caoutchouc, wire gauze, &o. Also a soft-solderwire could be employed and soldered to the flanges b, b by heating. Insuch case the tape 0 serves to protect the soldered joint from traction,pressure or other detrimental strains.

It is to be understood that changes in the form, proportion, size andthe minor details may be made within the scope indicated by the appendedclaim, without departing from the spirit or sacrificingany of theadvantages of this invention. For instance, a packing may be dispensedwith, as shown in Fig. 6.

It will be readily noted from the foregoing description and the drawingsforming part thereof, that a certain important feature is common to allof the embodiments illustrated. The feature referred to is the exteriorradially disposed protective rib which extends beyond the circularoutline of all other portions of the hose and is calculated to serve asa fender in preventing injury to the hose when the hose is moved over asurface or when the hose is struck against or struck by another object;the said protecbody from the outermost portions of the.

undulations and forming an exterior, radially projecting spiral jointfor the hose, and a channelshaped tape spirally wound around thefirst-named tape and engaging the said contiguous flanges, to tightlyclasp and hold said flanges firmly abutting and form a tight jointtherebetween, and to serve as a shoe in preventing injury to theremainder of the hose.

What I claim is:

In a spiral metallic hose, in combination, a spirally wound singlecorrugated metal tape undulated in cross section and bent outwardly atits longitudinal edges to present flanges extending radially outward ofthe body from outermost portions of the undulations, the contiguousflanges forming an exterior spiral joint for the hose, a second tapehavin in cross section the contour of an inverte U and spirally woundaround the first-named tape and engaging the said flanges to tightlyclas and hold the same together and form a tig t joint therebetween anda tightening wire inclosed by said second tape, the said flanges andsecond tape forming an exterior radially disposed protective rib whichextends beyond the circular out line of all other portions of theundulated hose, and the second tape alone being adapted to serve as ashoe.

In witness whereof I have hereunto signed my name this nineteenth day ofFebruar A. D. 1914, in the presence of two subscri ing Witnesses.

EMIL WITZENMANN.

Witnesses:

* FRIDA BLAIBEB,

Emms'r ENTENMANN.

